Question 1

The Nyquist theorem states that the

Accepted Answer

A)   sampling frequency must be equal to the input signal bandwidth.
B)   input signal bandwidth must be twice the sampling frequency.
C)   sampling frequency must be twice the input signal bandwidth.
D)   input signal bandwidth must be sampled twice.

Question 2

The higher the kilovoltage peak,the

Accepted Answer

A)   wider the histogram.
B)   narrower the histogram.
C)   higher the frequency.
D)   lower the frequency. B

Question 3

Historical study of patient examinations can be accomplished through the manual send function.

Accepted Answer

A) True 
 B)False

Question 4

Excessive light entering the eye when viewing an image is known as ______ glare.

Accepted Answer

A)   veil
B)   window
C)   level
D)   None of these

Question 5

A look-up table is not used as a reference to

Accepted Answer

A)   set appropriate kilovoltage peak and milliampere-seconds values.
B)   evaluate raw luminance values.
C)   correct luminance values.
D)   provide appropriate brightness and contrast.

Question 6

High-pass filtering is useful for enhancing

Accepted Answer

A)   small structures.
B)   fine bone tissues.
C)   large bony structures.
D)   organs and soft tissue.

Question 7

The longer an image is stored in the computed radiography (CR) cassette,the

Accepted Answer

A)   more detailed the processed image.
B)   more energy is lost by the electrons.
C)   easier the image is to process.
D)   slower the processing time.

Question 8

Window width controls the ratio of black and white,also known as

Accepted Answer

A)   window.
B)   level.
C)   contrast.
D)   matrix.

Question 9

Proper patient demographic input ensures

Accepted Answer

A)   multiple records on each patient.
B)   linking of all the patient's files.
C)   multiple versions of the patient's name.
D)   an increase in the amount of data tracking.

Question 10

Image aliasing is similar to the moiré effect caused by grid error.

Accepted Answer

A) True 
 B)False

Question 11

Shuttering removes the dark exposed border,reducing the amount of information to be stored.

Accepted Answer

A) True 
 B)False

Question 12

Image level parameters control image

Accepted Answer

A)   brightness.
B)   darkness.
C)   contrast.
D)   density. A

Question 13

Automatic rescaling means that images are produced,regardless of the amount of exposure,with

Accepted Answer

A)   uniform size and shape.
B)   uniform contrast and density.
C)   variable size and shape.
D)   variable contrast and density.

Question 14

Input of annotation for identification of the patient's left or right side

Accepted Answer

A)   should take the place of the technologist's anatomy markers.
B)   should be used in conjunction with the technologist's markers.
C)   eliminates the need for any other type of anatomy markers.
D)   None of the above

Question 15

The improper algorithm application may result in

Accepted Answer

A)   enhanced contrast.
B)   improved resolution.
C)   repeat examinations.
D)   degradation of the image.

Question 16

Averaging the frequency of each pixel with surrounding pixel values to remove high-frequency noise is called

Accepted Answer

A)   high-pass filtering.
B)   low-pass filtering.
C)   edge enhancement.
D)   noise enhancement.

Question 17

Data collected within the collimator are represented by a

Accepted Answer

A)   histogram.
B)   characteristic curve.
C)   pixel graph.
D)   matrix graph.

Question 18

A wraparound image or image aliasing occurs when

Accepted Answer

A)   sampling occurs twice per cycle.
B)   spatial frequency is less than the Nyquist frequency.
C)   sampling occurs less than twice per cycle.
D)   spatial frequency is equal to the Nyquist frequency.

Question 19

In an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image,______ occurs.

Accepted Answer

A)   overexposure
B)   underexposure
C)   automatic collimation
D)   automatic rescaling

Question 20

A histogram displays the useful signal by locating

Accepted Answer

A)   all pixel values.
B)   maximum and minimum signal.
C)   maximum signal only.
D)   minimum signal only. B

Exam 3: Digital Radiographic Image Processing and Manipulation

The Nyquist theorem states that the

Correct AnswerverifiedShow Answer

The higher the kilovoltage peak,the

Correct AnswerverifiedB

Historical study of patient examinations can be accomplished through the manual send function.

Correct AnswerverifiedShow Answer

Excessive light entering the eye when viewing an image is known as ______ glare.

Correct AnswerverifiedShow Answer

A look-up table is not used as a reference to

Correct AnswerverifiedShow Answer

High-pass filtering is useful for enhancing

Correct AnswerverifiedShow Answer

The longer an image is stored in the computed radiography (CR) cassette,the

Correct AnswerverifiedShow Answer

Window width controls the ratio of black and white,also known as

Correct AnswerverifiedShow Answer

Proper patient demographic input ensures

Correct AnswerverifiedShow Answer

Image aliasing is similar to the moiré effect caused by grid error.

Correct AnswerverifiedShow Answer

Shuttering removes the dark exposed border,reducing the amount of information to be stored.

Correct AnswerverifiedShow Answer

Image level parameters control image

Correct AnswerverifiedA

Automatic rescaling means that images are produced,regardless of the amount of exposure,with

Correct AnswerverifiedShow Answer

Input of annotation for identification of the patient's left or right side

Correct AnswerverifiedShow Answer

The improper algorithm application may result in

Correct AnswerverifiedShow Answer

Averaging the frequency of each pixel with surrounding pixel values to remove high-frequency noise is called

Correct AnswerverifiedShow Answer

Data collected within the collimator are represented by a

Correct AnswerverifiedShow Answer

A wraparound image or image aliasing occurs when

Correct AnswerverifiedShow Answer

In an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image,______ occurs.

Correct AnswerverifiedShow Answer

A histogram displays the useful signal by locating

Correct AnswerverifiedB

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B

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A

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B